module Polygallery
  module HasPolyphotos
    extend ActiveSupport::Concern

    included do
    end

    module ClassMethods
      def has_polyphotos(title=nil, options={})
        attr_accessor :polygallery_options

        defaults = self.polygallery_settings
        association_names = (options[:association_names].present? ? 
                             options : defaults)[:association_names]
        title ||= association_names[:photos].to_s
        if title.is_a? Hash
          options = title
          title = association_names[:photos].to_s
        end

        settings = defaults.deep_merge options

        has_many association_names[:photos],
                 settings[:associations][:photos].deep_merge({})
        accepts_nested_attributes_for association_names[:photos],
                 settings[:nested_attributes][:photos]

        after_initialize do
          @polygallery_settings = settings if settings == HasPolygallery::DEFAULTS
          self.initialize_polygallery
        end

        include HasPolyphotos::LocalInstanceMethods
      end

      def polygallery_settings
        @polygallery_settings || HasPolygallery::DEFAULTS
      end
    end


    module LocalInstanceMethods
      def set_nest(photo)
        photo.send(:"#{title}=", self) if photo.send(:"#{title}").nil?
        photo.galleryable_id ||= galleryable_id
        photo.galleryable_type ||= galleryable_type
        photo.gallery_title ||= title
      end

      # def polygallery_settings
      #   Kernel.const_get(self.galleryable_type).send :"#{self.title}_settings"
      # end

      def include_polygallery_settings(settings)
        @polygallery_settings = self.polygallery_options = settings
        self.initialize_polygallery
      end

      def initialize_polygallery
        settings = self.polygallery_settings
        association_names = settings[:association_names]
        # self.class.has_many association_names[:photos],
        #   settings[:associations][:photos].deep_merge({})
        # self.class.accepts_nested_attributes_for association_names[:photos],
        #                               settings[:nested_attributes][:photos]
      end

      def build_first_photo
        settings = polygallery_settings
        photo_association = send settings[:association_names][:photos]
        photo_association.build(
            :polygallery_options => settings,
            :galleryable_id => galleryable_id,
            :galleryable_type => galleryable_type,
            :gallery_title => self.title
        ) unless photo_association.any?
      end

      def polygallery_settings
        polygallery_options || @polygallery_settings || HasPolygallery::DEFAULTS
      end
    end
  end
end

ActiveRecord::Base.send :include, Polygallery::HasPolyphotos